UNunnums
2031

UN 2031Nitric acid other than red fuming, with more than 70 percent nitric acid or Nitric acid other than red fuming, with not more than 70 percent nitric acid

Class 8

Corrosives

Summary

UN 2031 is the UN number for nitric acid other than red fuming, with more than 70 percent nitric acid or Nitric acid other than red fuming, with not more than 70 percent nitric acid. It is classed in Class 8 (corrosives) for transport. Packing group I or II, depending on the form. Emergency responders use ERG guide 157.

Emergency response

The Emergency Response Guidebook (ERG2024) guide for this number:

  • Guide157Nitric acid, other than red fuming, with more than 65% nitric acidNitric acid, other than red fuming, with not more than 65% nitric acid

From the 2024 Emergency Response Guidebook (ERG2024), published by U.S. Department of Transportation, PHMSA. Read the full guide in the ERG or on CAMEO Chemicals.

Identification

UN number
UN 2031
Name
Nitric acid other than red fuming, with more than 70 percent nitric acid or Nitric acid other than red fuming, with not more than 70 percent nitric acid
Hazard class
Class 8: Corrosives
Packing group
I, II
What the class covers
Substances which can damage living tissue or other goods and materials on contact.

U.S. Hazardous Materials Table

4 entries share this number in 49 CFR 172.101, by name, packing group or where the shipment is going.

  • UN2031Nitric acid

    other than red fuming, with at least 65 percent, but not more than 70 percent nitric acid

    Special provisions: B2, B47, B53, IB2, IP15, T8, TP2

    Class
    8
    Packing group
    II
    Labels
    8, 5.1

  • UN2031Nitric acid

    other than red fuming, with more than 20 percent and less than 65 percent nitric acid

    Special provisions: A212, B2, B47, B53, IB2, IP15, T8, TP2

    Class
    8
    Packing group
    II
    Labels
    8

  • UN2031Nitric acid

    other than red fuming with not more than 20 percent nitric acid

    Special provisions: B2, B47, B53, IB2, T8, TP2

    Class
    8
    Packing group
    II
    Labels
    8

  • UN2031Nitric acid

    other than red fuming, with more than 70 percent nitric acid

    Special provisions: B47, B53, T10, TP2, TP12, TP13

    Class
    8
    Packing group
    I
    Labels
    8, 5.1

From the eCFR edition of 49 CFR 172.101 dated 2026-10-05 (section last amended 2026-09-08). The eCFR is an editorial compilation, not the official legal edition. Read the current table.

About Class 8

Class 8 covers corrosive substances such as acids, alkalis and battery fluid, which can destroy skin or corrode metal on contact.

See all Class 8 UN numbers

Check the official sources

For emergency response, packaging and quantity limits, use these: